Excess enthalpies of ten binary mixtures of each of methyl methylthiomethyl sulfoxide (MMTSO) and dimethyl sulfoxide (DMSO) with one of the cycloethers (oxane, 1,3-and 1,4-dioxanes, oxolane and 1,3-dioxolane) have been determined at 298.15 K. All the mixtures show positive excess enthalpies over the whole composition range. Excess enthalpies of the cycloether + MMTSO or DMSO decrease with increasing number of oxygen atoms in the cycloether molecules, except for oxolane + MMTSO. Excess enthalpies of MMTSO + cycloethers are smaller than those of DMSO + cycloethers for the same cycloether except for the 1,3-dioxolane mixtures.
Benzolseleninsäureanhydrid (BSA) dehydriert das Lacton (I) zu (II), das von SeOZ zu dem Aldehyd (III) oxidiert wird (bei BSA‐Überschuß erhält man (III) als Nebenprodukt aus (I) in 6‐7proz. Ausb.; als weiteres Nebenprodukt kann (IV) anfallen).
When 9,9-ethylenedioxy-6-methoxycarbonyl-5-methyl-2-oxabicyclo[4.4.0]decan-3-one was treated with benzeneseleninic anhydride and selenium dioxide, the former yielded preferentially the 4,5-dehydrogenated compound (2) together with small amounts of the 5-formyl compound (3) and the contraction product (4) of the δ-lactone ring, while the latter produced solely 2 in a poor yield.
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